As long as you can buy a bicycle in a toy store, a bicycle
will be a toy. And as long as the only pre-requisite for
purchasing one is to know which color you want, most people
won't take riding one very seriously.

Bicycle licensing, anybody?

=v= Nope.

=v= Bicycle licensing has not proven to be necessary in the
parts of the world where bicycling is taken seriously, not
even under the world's most totalitarian Maoist regime. So
there's no reason to impose it in the U.S. or anywhere else.

=v= Indeed, it would just create (yet another) barrier.
_Jym_